Small update.
I directly contacted the service provider of the affected user by
phone. The technical support team did not agree to provide further
details on the ground that I am not a customer. I was just asking for
one anonymous request line in their logs showing how Plume CMS was
called to trigger the security issue they clame they have seen. I am a
bit annoyed, the affected user will I hope ask this question directly.
I am still skeptic.
Do not worry, make a backup, we take care of you!
loïc